Results 21 to 30 of about 1,425,422 (190)

Role of grain boundaries in magma migration and storage [PDF]

Earth and Planetary Science Letters, 2006
We employ a continuous theory of two-phase flow to investigate the influence of grain boundary tension on distribution and migration of melts through a viscous matrix. The ‘disaggregation melt fraction’, the volume fraction of partial melt at which grain boundaries are completely wetted, is crucial in determining the total interfacial force per unit ...
Hier-Majumder, S., Ricard, Yanick, Bercovici, D.   +2 more
openaire   +2 more sources

The Crustal Magma Storage System of Volcán Quizapu, Chile, and the Effects of Magma Mixing on Magma Diversity [PDF]

Journal of Petrology, 2012
Crystal zoning as well as temperature and pressure estimates from phenocryst phase equilibria are used to constrain the architecture of the intermediate-sized magmatic system (some tens of km 3 ) of Volcan Quizapu, Chile, and to document the textural and compositional effects of magma mixing.
Philipp Ruprecht, George W. Bergantz, Kari M. Cooper, Wes Hildreth   +3 more
openaire   +1 more source

The Prevalence and Significance of Offset Magma Reservoirs at Arc Volcanoes

Geophysical Research Letters, 2020
Determining the spatial relations between volcanic edifices and their underlying magma storage zones is fundamental for characterizing long‐term evolution and short‐term unrest.
Allan H. Lerner, Daniel O'Hara, Leif Karlstrom, Susanna K. Ebmeier, Kyle R. Anderson, Shaul Hurwitz   +5 more
doaj   +1 more source

Magma storage conditions beneath Krakatau, Indonesia: insight from geochemistry and rock magnetism studies

Frontiers in Earth Science, 2023
Understanding the evolution of magma storage conditions on volcanoes which have had more than one caldera-forming eruption (CFE) is important to know about past and present conditions, as a key to forecast future potential hazards.
Aditya Pratama, Aditya Pratama, Dini Nurfiani, Putu Billy Suryanata, Putu Billy Suryanata, Taufik Ismail, Taufik Ismail, Taufik Ismail, Gabriela Nogo Retnaningtyas Bunga Naen, Mirzam Abdurrachman, Mirzam Abdurrachman, Wilfridus Ferdinando Supriyadi Banggur, Nining Sumawati Asri, Ratika Benita Nareswari, Satria Bijaksana, Muhammad Hanif, Estu Kriswati, Idham Andri Kurniawan, Idham Andri Kurniawan, Nugroho Imam Setiawan   +19 more
doaj   +1 more source

Advances in seismic imaging of magma and crystal mush

Frontiers in Earth Science, 2022
Seismic imaging methods have provided detailed three-dimensional constraints on the physical properties of magmatic systems leading to invaluable insight into the storage, differentiation and dynamics of magma.
Michele Paulatto, Emilie E. E. Hooft, Kajetan Chrapkiewicz, Benjamin Heath, Douglas R. Toomey, Joanna V. Morgan   +5 more
doaj   +1 more source

Pre-Eruptive Magma Configurations and Petrogenetic Relationships of the Rattlesnake Tuff, Oregon–Insights From Spectacularly Banded High-Silica Rhyolite Pumices

Frontiers in Earth Science, 2022
The 7.1 Ma Rattlesnake Tuff (RST) of eastern Oregon is a widespread and voluminous (>300 km3) ignimbrite composed of 99% crystal poor (≤1%) high-silica rhyolite (HSR) and <1% dacites.
Vanessa M. Swenton, Martin J. Streck
doaj   +1 more source

Mantle and Crustal Xenoliths in a Tephriphonolite From La Palma (Canary Islands): Implications for Phonolite Formation at Oceanic Island Volcanoes

Frontiers in Earth Science, 2022
The occurrence of mantle-derived peridotite xenoliths in phonolitic melts is a rare phenomenon, and is commonly ascribed to a mantle origin of the phonolite.
Andreas Klügel, Elmar Albers, Thor H. Hansteen   +2 more
doaj   +1 more source

Linking Magma Storage and Ascent to Eruption Volume and Composition at an Arc Caldera

Geophysical Research Letters, 2020
Conceptual models of magma storage and transport under calderas favor a connected system of sills and dikes. These features are individually below the resolution of standard seismic tomography, but radial seismic anisotropy can reveal where they exist in
David Miller, Ninfa Bennington, Matthew Haney, Paul Bedrosian, Kerry Key, Clifford Thurber, Laney Hart, Summer Ohlendorf   +7 more
doaj   +1 more source

Tectonic Controls on Global Variations of Large-Magnitude Explosive Eruptions in Volcanic Arcs

Frontiers in Earth Science, 2020
Linking tectonic setting to eruptive activity in volcanic arcs provides a framework to understand processes that control the production, accumulation and eruption of magma on Earth.
Tom Sheldrake, Luca Caricchi, Marco Scutari   +2 more
doaj   +1 more source

Staged storage and magma convection at Ambrym volcano, Vanuatu [PDF]

Journal of Volcanology and Geothermal Research, 2016
AbstractNew mineral-melt thermobarometry and mineral chemistry data are presented for basaltic scoriae erupted from the Mbwelesu crater of Ambrym volcano, Vanuatu, during persistent lava lake activity in 2005 and 2007. These data reveal crystallisation conditions and enable the first detailed attempt at reconstruction of the central magma plumbing ...
Sheehan, Fionnuala, Barclay, Jennifer
openaire   +2 more sources